ekasamaye cobhayānavadhāraṇam [YS 4.20]

na caikasmin kṣaṇe svapararūpāvadhāraṇaṃ yuktaṃ, kṣaṇikavādino yad bhavanaṃ saiva kriyā tad eva ca kārakam ity abhyupagamaḥ.

syān matiḥ svarasaniruddhaṃ cittaṃ cittāntareṇa samanantareṇa gṛhyata iti ---